
Timer Operation SXT
A. Meter Immediate Control
(Not used on SXT filter systems.)
A Meter Immediate control measures water usage and regenerates
the system as soon as the calculated system capacity is depleted.
The control calculates the system capacity by dividing the unit
capacity (typically expressed in grains/unit volume) by the feedwater
hardness and subtracting the reserve. Meter Immediate systems
generally do not use a reserve volume. The control will also start a
regeneration cycle at the programmed regeneration time if a number
of days equal to the regeneratio day override pass before water
usage depletes the calculated system capacity.
B. Meter Delayed Control
(Not used on SXT filter systems.)
A Meter Delayed Control measures water usage. The system
regenerates at the programmed regeneration time after the
calculated system capacity is depleted. As with Meter Immediate
systems, the control calculates the system capacity by dividing the
unit capacity by the feedwater hardness and subtracting the reserve.
The reserve should be set to insure that the system delivers treated
water between the time the system capacity is depleted and the
actual regeneration time. A Meter Delayed control will also start a
regeneration cycle at the programmed regeneration time if a number
of days equal to the regeneration day override pass before water
usage depletes the calculated system capacity.
C. Time Clock Delayed Control
A Time Clock Delayed Control regenerates the system on a
timed interval. The control will initiate a regeneration cycle at the
programmed regeneration time when the number of days since the
last regeneration equals the regeneration day override value.
D. Day of the Week Control
This control regenerates the system on a weekly schedule. The
schedule is defined in Master programming by setting each day to
either "off" or "on". The control will initiate a regeneration cycle on
days that have been set to "on" at the specified regeneration time.
E. Control Operation During Regeneration
During regeneration, the control displays a special regeneration
display. In this display, the control shows the current regeneration
step number the valve is advancing to, or has reached, and the time
remaining in that step. The step number that displays flashes until
the valve completes driving to this regeneration step position. Once
all regeneration steps are complete the valve returns to service and
resumes normal operation.
Pressing the Extra Cycle button during a regeneration cycle
immediately advances the valve to the next cycle step position and
resumes normal step timing.
F. Control Operation During Programming
The control only enters the Program Mode with the valve in service.
While in the Program Mode, the control continues to operate
normally monitoring water usage and keeping all displays up to date.
Control programming is stored in memory permanently.
G. Manually Initiating a Regeneration
1. When timer is in service, press the Extra Cycle button for 5
seconds on the main screen.
2. The timer advances to Regeneration Cycle Step #1 (backwash),
and begins programmed time count down.
3. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #2 (brine draw & slow rinse). Not used
on SXT filter systems).
4. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #3 (rapid rinse).
5. Press the Extra Cycle button once to advance valve to
Regeneration Cycle Step #4 (brine refill). Not used on SXT filter
systems.
6. Press the Extra Cycle button once more to advance the valve
back to in service.
NOTE: If the unit is a filter or upflow, the cycle step order
may change.
A queued regeneration can be initiated by pressing the Extra Cycle
button. To clear a queued regeneration, press the Extra Cycle button
again to cancel. If regeneration occurs for any reason prior to the
delayed regeneration time, the manual regeneration request will be
cleared
H. Control Operation During a Power Failure
The SXT includes integral power backup. In the event of power
failure, the control shifts into a power-saving mode. The control stops
monitoring water usage. The display and motor shut down, but it
continues to keep track of the time and day for a minimum of 12
hours.
The system configuration settings are stored in a non-volatile
memory and are stored indefinitely with or without power. The Time
of Day flashes when there has been a power failure. Press any
button to stop the Time of Day from flashing.
If power fails while the unit is in regeneration, the control will save the
current valve position before it shuts down. When power is restored,
the control will resume the regeneration cycle from the point where
power failed.
If power fails during a regeneration cycle, the valve will remain in it’s
current position until power is restored. The valve system should
include all required safety components to prevent overflows resulting
from a power failure during regeneration.
The control will not start a new regeneration cycle without power. If
the valve misses a scheduled regeneration due to a power failure,
it will queue a regeneration. Once power is restored, the control
will initiate a regeneration cycle the next time that the Time of Day
equals the programmed regeneration time. Typically, this means that
the valve will regenerate one day after it was originally scheduled.
If the treated water output is important and power interruptions
are expected, the system should be setup with a sufficient reserve
capacity to compensate for regeneration delays.
CAUTION
!
NOTICE
W110 LXT Downflow Softeners and SXT Filters 10